Stand column repairing method

Abstract

The invention discloses a stand column repairing method which comprises the steps that S1, a defective stand column is detected, and a defective section of the defective stand column is found out; s2, temporary supporting pieces are arranged on earthworks on the two sides, in the length direction of the supporting beam, of the faulty stand column correspondingly, each temporary supporting piece is provided with a supporting end capable of moving in the vertical direction, the supporting ends are connected to the supporting beam, and the temporary supporting pieces are started to lift the supporting beam; s3, earthwork between the faulty stand column and the temporary supporting piece is excavated till the faulty section of the faulty stand column is completely exposed; s4, the problem segments are cleaned; s5, concrete is poured on the outer side of the problem segment to form a repaired concrete segment; and S6, the supporting beams are reinforced. Compared with the prior art, the problem stand column can be repaired in situ, two stand column piles and cross beams do not need to be newly constructed for underpinning according to a conventional scheme, and the construction period and the manufacturing cost can be better saved.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology, and in particular to a method for repairing columns. Background Technology

[0002] Existing deep foundation pit projects must use support beams to support the retaining walls on both sides. When the support beams are too long, columns need to be installed on the foundation pit to provide vertical support for the middle section of the support beams.

[0003] Columns are generally constructed using cast-in-place piles. However, during the construction of cast-in-place piles, due to non-standard construction or problems with concrete pouring, mud inclusions may occur in the pile body, resulting in discontinuity of the concrete in the length direction. This reduces the overall structural strength. During the excavation of the foundation pit, the force on the column from the supporting beam gradually increases, causing the column body to bend. Immediate remedial measures are required. Summary of the Invention

[0004] The purpose of this invention is to provide a column repair method to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0005] The solution to the technical problem of this invention is: A method for repairing a column, comprising: The problematic columns were inspected to identify the problematic segments. Temporary supports are installed on the earthwork on both sides of the problem column along the length of the support beam. Each temporary support has a support end that can move in the vertical direction. The support end is connected to the support beam, and the temporary support is activated to lift the support beam. Excavate the soil between the problematic column and the temporary support until the problematic segment of the problematic column is completely exposed. Clean the problematic segments; Concrete was poured on the outside of the problematic segment to form a repair concrete segment; Reinforce the supporting beam.

[0006] This technical solution has at least the following beneficial effects: First, by using temporary supports to temporarily support the support beam above the problematic column, the load on the problematic column is temporarily eliminated. Construction workers can repair the problematic column safely, reducing the risk of accidents caused by the lack of column support on the support beam. Second, by repairing the problematic column in situ without disassembly, compared to reconstructing a new complete column on the side of the problematic column, it not only reduces the construction cost of dismantling the column and re-grouting the pile, but also speeds up the reconstruction process and reduces the construction cycle, as only the problematic segment needs to be repaired.

[0007] As a further improvement to the above technical solution, the excavation of the soil between the problematic column and the temporary support includes: driving multiple sheet piles around the problematic column to form a retaining wall, and then excavating the soil within the retaining wall.

[0008] By adopting the above technical solutions, the retaining wall, once formed, can block the soil on the outside during excavation, improve the stability of the soil during excavation, create a good construction environment, and reduce the risks for construction workers when cleaning and pouring concrete around the problematic columns.

[0009] As a further improvement to the above technical solution, the step of pouring concrete outside the problematic segment to form a repair concrete segment includes: inserting repair steel bars into the problematic segment, installing a mold, pouring concrete into the mold until the concrete sets, and forming the repair concrete segment that encloses the problematic segment.

[0010] By adopting the above technical solution, after the problematic column is cleaned, the internal steel structure that was covered by mud will be directly exposed. At this time, the repair steel bars are directly welded to the steel structure of the problematic column. After connecting the repair steel bars to the original problematic column, compared with directly pouring concrete on the original steel bars to form repair concrete segments, the connection strength between the repair concrete segments and the original problematic column is better, the structure is more stable, and the overall load-bearing capacity of the column is stronger after repair.

[0011] As a further improvement to the above technical solution, the reinforcement of the support beam includes: implanting reinforcing steel bars into the support beam and pouring concrete to form a reinforced concrete layer.

[0012] When mud inclusion is found in a problematic column, the supporting beam above it may bend under stress or even develop cracks on its upper surface, severely affecting its load-bearing capacity. By adopting the above-mentioned technical solution, construction personnel constantly monitor the stress and structure of the supporting beam to prevent displacement and settlement. When it is found that the supporting beam is sinking below the design elevation, the support height of the temporary supports is adjusted in time. At the same time, a reinforcing concrete layer is laid on the supporting beam to strengthen the structural strength of the segment of the supporting beam above the problematic column and improve its load-bearing capacity.

[0013] As a further improvement to the above technical solution, The process of implanting reinforcing steel bars into the support beam includes: The reinforcing steel includes multiple sets of first open stirrups. The support beam has multiple sets of first open stirrups arranged along its own length direction. Multiple first open stirrups in the same set are arranged along the width direction of the support beam. Multiple sets of support beam longitudinal bars are provided on the support beam. Multiple first open stirrups in the same set correspond one-to-one with multiple sets of support beam longitudinal bars. Break open the concrete on the upper surface of the support beam, connect the two ends of the plurality of first open stirrups to the two longitudinal bars of the support beam at the ends of the support beam along the width direction of the corresponding group, and set thickened longitudinal bars in each of the first open stirrups.

[0014] By adopting the above technical solution, after the first open stirrup is connected to the support beam, the first open stirrup can act as a bridge connecting the reinforced concrete layer and the support beam. After the reinforced concrete layer is formed by pouring concrete, the stability of its connection with the support beam is improved. At the same time, after the two ends of the first open stirrup are connected to the longitudinal reinforcement of the support beam, a closed space is formed between it and the longitudinal reinforcement of the support beam, which can block the thickened longitudinal reinforcement. That is, after the thickened longitudinal reinforcement is welded and fixed to the first open stirrup, it is blocked by the first open stirrup, thereby improving the stability of the reinforced longitudinal reinforcement within the first open stirrup, and thus improving the structural stability of the entire reinforced concrete layer.

[0015] As a further improvement to the above technical solution, the thickness of the reinforced concrete layer gradually decreases from the direction away from to the direction near the end of the supporting beam.

[0016] By adopting the above technical solution, the thickness of the reinforced concrete layer is greatest at the top of the problematic column, and gradually decreases in thickness in the horizontal direction away from the problematic column. This is because the problematic column originally only provided vertical support for the supporting beam. When a certain length of reinforced concrete layer is covered on the supporting beam, its overall weight increases, and the support strength is insufficient in the part of the supporting beam next to the problematic column. Therefore, the reinforced concrete layer is gradually thinned towards the end, that is, the weight is gradually reduced in that area, reducing the overall weight of the unsupported part, thereby reducing the risk of settlement and cracking of the supporting beam in that part.

[0017] As a further improvement to the above technical solution, the temporary support includes a first jack, wherein the first lifting rod of the first jack extends vertically, and the support end is the end of the first lifting rod.

[0018] By adopting the above technical solution, the first jack directly lifts the support beam, and two temporary support components simultaneously support the support beam on both sides of the problematic column, providing a stable foundation for the construction personnel to support the problematic column.

[0019] As a further improvement to the above technical solution, each temporary support includes a second jack, a push block, and a connecting block. The connecting block is installed on the lower surface of the support beam, and a first guide surface is provided on the lower surface of the connecting block. The distance between the first guide surface and the lower surface of the support beam gradually decreases as it approaches or moves away from another temporary support. The second jack is placed on the earthwork, and the first lifting rod of the second jack extends horizontally. The push block is located below the connecting block, and a second guide surface is provided on the upper surface of the push block. The distance between the second guide surface and the lower surface of the support beam gradually decreases as it approaches or moves away from another temporary support. The push block can move along the length of the support beam under the push of the second jack, and the push block can move until the first guide surface abuts against the second guide surface.

[0020] By adopting the above technical solution, the second jack's support end first moves laterally, pushing the push block horizontally until the second guide surface on the push block contacts the first guide surface on the connecting block. Then, the push block continues to move, and under the action of the first and second guide surfaces, the push block lifts the connecting block and drives the support beam, which is fixed relative to the connecting block, to move upward, temporarily replacing the problem column to provide vertical support for the support beam. Secondly, the support beam is lifted by the relative displacement between the connecting block and the push block. Construction workers can make connecting blocks and push blocks of appropriate specifications according to the site dimensions, that is, adjust the inclination of the first and second guide surfaces. When the support beam needs to be adjusted within a large range, only a small stroke of the second jack is needed to push the push block to generate a large relative displacement in the vertical direction, greatly saving the stroke required by the jack and thus saving the cost of purchasing jacks with a large stroke.

[0021] As a further improvement to the above technical solution, a polytetrafluoroethylene (PTFE) plate is provided on the earthwork, and the pusher slides on the PTFE plate.

[0022] By adopting the above technical solution, after fixing the polytetrafluoroethylene plate to the earthwork, the smooth plate surface reduces the friction between the push block and the earthwork, making it easier for the push block to slide. Moreover, after reducing friction, the push block is not easily deformed, reducing the damage to the push block's own structure under friction.

[0023] As a further improvement to the above technical solution, after cleaning the problematic segment, the push block and the connecting block of the two temporary support members are connected to the support beam and the column by connecting concrete, and then the second jack is removed.

[0024] By adopting the above technical solution, when the repair of the problematic column and the reinforcement of the upper support beam are completed, the overall weight of the support beam increases. In order to improve the connection stability and load-bearing strength between the problematic column and the support beam at this time, the movement stroke of the second jack is first fixed, that is, the connecting block and the push block are positioned at this time. Then, the connecting block, the problematic column and the support beam, as well as the push block, the problematic column and the support beam, are all connected by reinforced concrete. The temporarily set push block and connecting block serve as the permanent connection structure between the problematic column and the support beam, thereby improving the connection strength between the problematic column and the support beam. Furthermore, after fixing the connecting block and the push block in this way, there is no load on the support end of the second jack, which facilitates dismantling. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of the present invention, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the planar positions of the problematic column, support beam, and temporary support in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the overall structure of the problematic column, support beam, and temporary support in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the overall structure of the problematic column, the repaired concrete segment, and the supporting beam in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the overall structure of the problematic column, supporting beam, and reinforced concrete layer in Embodiment 1 of the present invention; Figure 5 This is a cross-sectional view of the support beam and the reinforced concrete layer in Embodiment 1 of the present invention, viewed from the axial direction of the support beam. Figure 6 This is a cross-sectional view of the supporting beam and the reinforced concrete layer in Embodiment 1 of the present invention from a horizontal perspective; Figure 7 This is a schematic diagram of the overall structure of the problem column, the support beam, and the temporary support when the support beam is lifted in Embodiment 2 of the present invention. Figure 8 This is a schematic diagram of the overall structure of the problematic column, supporting beam, connecting block, and push block after the repair of the problematic column is completed in Embodiment 2 of the present invention.

[0027] Figure label: 1. Problematic column; 2. Problematic segment; 21. Repaired concrete segment; 211. Repaired reinforcing steel; 212. Vertical longitudinal reinforcement; 213. Connecting reinforcing steel; 3. Support beam; 31. Reinforced concrete layer; 32. First opening stirrup; 33. Second opening stirrup; 4. Temporary support; 41. First jack; 42. Second jack; 43. Push block; 44. Connecting block; 5. Sheet pile; 6. Connecting concrete. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0030] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0032] In existing foundation pit support systems, when the excavation depth exceeds a certain limit, support beams are needed to support the retaining walls on both sides of the pit. Vertical columns are installed in the middle of the pit to support these beams. These columns are typically constructed using cast-in-place piles. However, during construction, improper workmanship or concrete pouring issues can lead to mud inclusions within the piles, reducing the overall strength of the column. In conventional engineering, the solution to this problem is to discard the original mud-inclusion pile and construct two new cast-in-place piles on either side of the original column, adding a horizontal beam to support the horizontal support beam. The force from the support beam is then transferred to the horizontal beam and subsequently to the two newly constructed piles. While this method solves the problem of mud inclusions in the initially constructed reinforced concrete columns, the cost is too high, and the construction period is long, which is detrimental to project construction.

[0033] Example 1 Therefore, this application provides a method for repairing a column, which includes, but is not limited to, the following steps: S1: Detect the problematic column 1 and find the problematic segment 2 of the problematic column 1.

[0034] Specifically, there are two testing methods depending on the on-site construction progress.

[0035] Firstly, after the column construction is completed, core sampling is performed on the column. A drilling machine is used to drill holes in the column to take samples. After taking out the core samples, a clear judgment is made on the mud inclusion in the pile body, the length of the pile foundation, the concrete strength, the thickness of the sediment at the bottom of the pile, and the condition of the bearing layer. If there is a fault in the middle of the core sample and the two discontinuous parts are not connected to each other, then there is mud inclusion in the middle. After measuring the length of the faulty segment 2, the depth of the mud inclusion can be obtained.

[0036] Secondly, when the construction of support beam 3 is completed and the earthwork is excavated to a certain depth, cracks, settlement or horizontal displacement appear on support beam 3. At this time, it is determined that there is mud in the problematic column. Combined with the concrete pouring record, the depth of the problematic segment 2 is preliminarily determined.

[0037] S2: Reference Figure 1 and Figure 2 Temporary support members 4 are installed on the soil on both sides of the problem column 1 along the length of the support beam 3. The temporary support members 4 have support ends that can move in the vertical direction. The support ends are connected to the support beam 3, and the temporary support members 4 are activated to lift the support beam 3.

[0038] Specifically, based on the predetermined elevation of the support beam 3, the height of the support end of the temporary support 4 is adjusted so that the support beam 3 is raised to the predetermined elevation and kept in balance. The height of the support beam 3 above the problematic column 1 is constantly monitored. If the support beam 3 settles or shifts, the lifting height of the temporary support 4 for the support beam 3 is adjusted in a timely manner to reduce the occurrence of serious cracking and other problems in the already constructed support beam 3.

[0039] S3: Reference Set Figure 2 and Figure 3 Excavate the soil between the problematic column 1 and the temporary support 4 until the problematic segment 2 of the problematic column 1 is completely exposed.

[0040] Specifically, during excavation, the excavation was carried out along the perimeter of the problematic column, and after measurement to ensure that construction personnel could completely enter and exit the excavated pit, the excavation was stopped.

[0041] S4: Cleaning problem segment 2.

[0042] Specifically, construction workers carried high-pressure water guns to the problematic section 2 and used the high-pressure water flow to quickly wash away the soil on the problematic column 1 without damaging the original concrete structure of the problematic column 1.

[0043] S5: Reference Figure 3 Concrete was poured on the outside of the problematic segment 2 to form the repair concrete segment 21.

[0044] Specifically, the construction workers measured the length of the problematic segment 2, made a mold that could completely cover the problematic segment 2, installed the mold on the problematic segment 2, and then poured concrete into it. After the concrete solidified, the repair concrete segment 21 was formed.

[0045] S6: Reinforced support beam 3.

[0046] Specifically, refer to Figure 4 After the repair of the problematic column 1 was completed, it was detected that the support beam 3 was sinking below the design elevation. At this time, a reinforcing concrete layer 31 was added to the upper part of the support beam 3 to reinforce its overall structure.

[0047] As can be seen from the above, firstly, the solution uses temporary support 4 to temporarily support the support beam 3 above the problematic column 1, temporarily eliminating the load on the problematic column 1. Construction workers can repair the problematic column 1 while ensuring safety, reducing the risk of accidents caused by the lack of column support on the support beam 3. Secondly, the non-disassembly repair of the problematic column 1 in situ, compared to reconstructing a new complete column on the side of the problematic column 1, not only reduces the construction cost of dismantling the column and re-grouting the pile, but also only requires repair of the problematic segment 2, which speeds up the reconstruction and reduces the construction cycle.

[0048] In some embodiments, refer to Figure 2 The temporary support 4 includes a first jack 41, the first lifting rod of the first jack 41 extends vertically, and the support end is the end of the first lifting rod. The first jack 41 directly lifts the support beam 3. The two temporary support components 4 support the support beam 3 on both sides of the problem column 1 at the same time, providing a stable foundation for the construction personnel to support the problem column 1.

[0049] Furthermore, when the support beam 3 is a certain distance from the excavated soil, a support can be set on the soil at a certain depth, and the first jack 41 can be placed on the support to increase the height of the first jack 41, making it easier for it to lift the support beam 3.

[0050] In some embodiments, the specific method of step S3 includes: Reference Figure 1 and Figure 2 Multiple sheet piles 5 are driven around the problematic column 1 to form a retaining wall. Then, the soil inside the retaining wall is excavated. After the retaining wall is formed, it can block the soil outside during the excavation process, improve the stability of the soil during excavation, create a good construction environment, and reduce the risks for construction workers when cleaning and pouring concrete around the problematic column 1.

[0051] Depending on the site conditions, in some embodiments, if the mud-bearing segment 2 is close to the support beam 3, steel sheet piles 5 can be constructed in the space where construction is possible on the ground. In some areas where steel sheet piles 5 cannot be constructed due to being blocked by the support beam 3, steel mesh can be installed and shotcrete can be sprayed simultaneously during the excavation process for support.

[0052] In addition, since the top elevation of the sheet piles 5 is relatively high after the sheet piles 5 are installed on the ground, it cannot meet the requirements for construction personnel to enter the space maintained by the sheet piles 5 to reinforce the problematic column 1. The solution to this problem is that when using sufficiently long sheet piles 5, the upper part of the sheet piles 5 that blocks the construction space can be cut off.

[0053] In other embodiments, when the mud-bearing problem segment 2 is far from the support beam 3, i.e. the foundation pit is excavated too deep, and the construction machinery can go down to a certain depth in the foundation pit to construct the sheet piles 5, in this case, the entire sheet pile 5 can be constructed directly without taking measures such as hanging steel mesh and spraying concrete for support.

[0054] In some embodiments, the method of step S5 includes: referring to Figure 3Repairing steel bars 211 are inserted into the problematic segment 2, and a mold is installed. Concrete is poured into the mold until it sets, forming a repaired concrete segment 21 that encloses the problematic segment 2. After the problematic column 1 is cleaned, the internal steel structure that was covered by mud will be directly exposed. At this time, the repairing steel bars 211 are directly welded to the steel structure of the problematic column 1. After connecting the repairing steel bars 211 to the original problematic column 1, compared with directly pouring concrete on the original steel bars to form the repaired concrete segment 21, the connection strength between the repaired concrete segment 21 and the original problematic column 1 is better, the structure is more stable, and the overall load-bearing capacity of the column is stronger after repair.

[0055] Specifically, the construction workers set multiple vertical longitudinal bars 212 of the repair steel bars 211 at intervals around the perimeter of the problematic column 1. Then, each vertical longitudinal bar 212 is connected to the steel structure inside the problematic column 1 by connecting steel bars 213 extending horizontally from the repair steel bars 211. Furthermore, if the problematic segment 2 is close to the support beam 3, the vertical longitudinal bars 212 of the repair steel bars 211 are connected to the steel structure of the support beam 3 to enhance the connection stability between the three.

[0056] In some embodiments, the specific method of step S6 includes: Reinforcing steel bars are inserted into the support beam 3, and concrete is poured to form a reinforced concrete layer 31.

[0057] When the problem column 1 is found to have mud inclusion, the support beam 3 located above the problem column 1 may bend under stress or even crack on its upper surface, seriously affecting its load-bearing performance. By adopting the above technical solution, the construction personnel constantly monitor the stress and structure of the support beam 3 to prevent displacement and settlement. When it is found that the support beam 3 has sunk below the design elevation, the support height of the temporary support 4 is adjusted in time. At the same time, a reinforcing concrete layer 31 is laid on the support beam 3 to strengthen the structural strength of the section of the support beam 3 above the problem column 1 and improve its load-bearing performance.

[0058] Specifically, refer to Figure 5 and Figure 6 The reinforcing steel includes multiple sets of first open stirrups 32. Multiple sets of first open stirrups 32 are arranged along the length of the support beam 3. Multiple first open stirrups 32 of the same set are arranged along the width of the support beam 3. Multiple sets of longitudinal bars of the support beam 3 are provided on the support beam 3. Multiple first open stirrups 32 of the same set correspond one-to-one with multiple sets of longitudinal bars of the support beam 3. The specific method of "inserting reinforcing bars on the support beam 3" includes: breaking open the concrete on the upper surface of the support beam 3, connecting the two ends of multiple first open stirrups 32 to the two longitudinal bars of the support beam 3 at the ends of the corresponding group along the width direction of the support beam 3, and setting thickened longitudinal bars in each first open stirrup 32.

[0059] By adopting the above technical solution, after the first open stirrup 32 is connected to the support beam 3, the first open stirrup 32 can serve as a bridge connecting the reinforced concrete layer 31 and the support beam 3. After the reinforced concrete layer 31 is formed by pouring concrete, the stability of its connection with the support beam 3 is improved. At the same time, after the two ends of the first open stirrup 32 are connected to the longitudinal bars of the support beam 3, a closed space is formed between it and the longitudinal bars of the support beam 3, which can block the thickened longitudinal bars. That is, after the thickened longitudinal bars are welded and fixed to the first open stirrup 32, they are blocked by the first open stirrup 32, thereby improving the stability of the reinforced longitudinal bars within the first open stirrup 32, and thus improving the structural stability of the entire reinforced concrete layer 31.

[0060] Furthermore, each group of first open stirrups 32 is provided with a second open stirrup 33. The length of the second open stirrup 33 along the width direction of the support beam 3 is greater than the length of the first open stirrup 32 along the same direction. The second open stirrup 33 can be welded and fixed to multiple first open stirrups 32 in the same group. The opening of the second open stirrup 33 is also provided with reinforcing longitudinal bars. The first open stirrups 32 and the reinforcing longitudinal bars in the second open stirrups 33 together serve as the longitudinal bars for reinforcing the concrete layer 31.

[0061] In some embodiments, because the problematic column 1 originally only provided vertical support for the supporting beam 3, after a certain length of reinforcing concrete layer 31 was added to the supporting beam 3, its overall weight increased, and the support strength of the portion of the supporting beam 3 corresponding to the problematic column 1 was insufficient. (Refer to...) Figure 4 The thickness of the reinforced concrete layer 31 gradually decreases from the direction away from to the end of the supporting beam 3.

[0062] This design results in the reinforced concrete layer 31 having the greatest thickness at the point directly above the problematic column 1, and the thickness gradually decreasing in the horizontal direction away from the problematic column 1. Therefore, the reinforced concrete layer 31 is gradually thinned towards the end, which means that the weight at that point is gradually reduced, thereby reducing the overall weight of the unsupported part and thus reducing the risk of settlement and cracking of the support beam 3 in that part.

[0063] Example 2 The difference between Embodiment 2 and Embodiment 1 in this application is that, referring to... Figure 7 and Figure 8Each temporary support 4 includes a second jack 42, a push block 43, and a connecting block 44. The connecting block 44 is installed on the lower surface of the support beam 3. The lower surface of the connecting block 44 is provided with a first guide surface. The distance between the first guide surface and the lower surface of the support beam 3 gradually decreases as it approaches or moves away from another temporary support 4. The second jack 42 is placed on the earthwork. The first lifting rod of the second jack 42 extends horizontally. The push block 43 is located below the connecting block 44. The upper surface of the push block 43 is provided with a second guide surface. The distance between the second guide surface and the lower surface of the support beam 3 gradually decreases as it approaches or moves away from another temporary support 4. The push block 43 can move along the length of the support beam 3 under the push of the second jack 42. The push block 43 can move until the first guide surface abuts against the second guide surface. In this scheme, the second jack 42 first moves laterally to push the push block 43 horizontally until the second guide surface on the push block 43 contacts the first guide surface on the connecting block 44. Then, the push block 43 continues to move. Under the action of the first and second guide surfaces, the push block 43 lifts the connecting block 44 and drives the support beam 3, which is fixed relative to the connecting block 44, to move upward, temporarily replacing the problem column 1 to provide vertical support for the support beam 3. Secondly, the support beam 3 is lifted by the relative displacement between the connecting block 44 and the push block 43. Construction workers can make connecting blocks 44 and push blocks 43 of corresponding specifications according to the site dimensions, that is, adjust the inclination of the first and second guide surfaces. When the support beam 3 needs to be adjusted within a large range, the second jack 42 only needs to push the push block 43 to move a small stroke to push the connecting block 44 and the push block 43 to produce a large relative displacement in the vertical direction, which greatly saves the stroke required by the jack and thus saves the cost of purchasing jacks with a large stroke.

[0064] As a further implementation, a polytetrafluoroethylene (PTFE) plate is provided on the earthwork, and the pusher block 43 can slide on the PTFE plate. After the PTFE plate is fixed on the earthwork, the friction between the pusher block 43 and the earthwork is reduced by the smooth plate surface, which facilitates the sliding of the pusher block 43. Moreover, after reducing friction, the pusher block 43 is not easily deformed, which reduces the damage to the structure of the pusher block 43 under friction.

[0065] Polytetrafluoroethylene plates can be installed on both the first and second guide surfaces to reduce friction between them, making the relative sliding between the connecting block 44 and the push block 43 smoother.

[0066] As a further implementation, the construction method between steps S5 and S6 also includes: connecting the push blocks 43 and connecting blocks 44 of the two temporary support members 4 to the support beam 3 and the column through connecting concrete 6, and then removing the second jack 42. Specifically, the construction workers set up supports on the excavated earthwork, fixed the body of the second jack 42 and the polytetrafluoroethylene plate to the fixed supports, and then placed the push block 43 on the polytetrafluoroethylene plate and connected it to the piston rod of the second jack 42. When the repair of the problematic column 1 and the reinforcement of the upper support beam 3 are completed, the overall weight of the support beam 3 increases. In order to improve the connection stability and load-bearing strength between the problematic column 1 and the support beam 3, the movement stroke of the second jack 42 is first fixed, that is, the connecting block 44 and the push block 43 are positioned. Then, the connection between the connecting block 44, the problematic column 1 and the support beam 3, and the connection between the push block 43, the problematic column 1 and the support beam 3 are all connected by reinforced concrete. The temporarily set push block 43 and the connecting block 44 serve as the permanent connection structure between the problematic column 1 and the support beam 3, thereby improving the connection strength between the problematic column 1 and the support beam 3. Furthermore, after fixing the connecting block 44 and the push block 43 in this way, there is no load on the support end of the second jack 42, which facilitates dismantling.

[0067] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A method for repairing a column, characterized in that, include: The problematic column (1) is inspected to identify the problematic segment (2) of the problematic column (1); Temporary support members (4) are respectively installed on the soil on both sides of the problem column (1) along the length direction of the support beam (3). The temporary support member (4) has a support end that can move in the vertical direction. The support end is connected to the support beam (3), and the temporary support member (4) is activated to lift the support beam (3). Excavate the soil between the problematic column (1) and the temporary support (4) until the problematic segment (2) is completely exposed; Clean the problematic segment (2); Concrete is poured on the outside of the problematic segment (2) to form a repair concrete segment (21); Reinforce the supporting beam (3).

2. The column repair method according to claim 1, characterized in that, The excavation of the earthwork between the problematic column (1) and the temporary support (4) includes: Multiple sheet piles (5) are driven around the problem column (1), forming a retaining wall, and then the soil inside the retaining wall is excavated.

3. The column repair method according to claim 2, characterized in that, The process of pouring concrete outside the problematic segment (2) to form a repair concrete segment (21) includes: Repairing steel bars (211) are inserted into the problematic segment (2), and a mold is installed. Concrete is poured into the mold until it sets, forming the repairing concrete segment (21) that encloses the problematic segment (2).

4. The column repair method according to claim 1, characterized in that, The reinforcement of the support beam (3) includes: Reinforcing steel bars are inserted into the support beam (3), and concrete is poured to form a reinforced concrete layer (31).

5. The column repair method according to claim 4, characterized in that, The method of inserting reinforcing steel bars into the support beam (3) includes: The reinforcing steel includes multiple sets of first open stirrups (32). The support beam (3) has multiple sets of first open stirrups (32) arranged along its own length direction. Multiple first open stirrups (32) of the same set are arranged along the width direction of the support beam (3). Multiple sets of longitudinal bars of the support beam (3) are provided on the support beam (3). Multiple first open stirrups (32) of the same set correspond one-to-one with multiple sets of longitudinal bars of the support beam (3). Break open the concrete on the upper surface of the support beam (3), connect the two ends of the plurality of first open stirrups (32) to the two longitudinal bars of the support beam (3) at the end of the width direction of the support beam (3) in the corresponding group, and set thickened longitudinal bars in each of the first open stirrups (32).

6. The column repair method according to claim 4, characterized in that, The thickness of the reinforced concrete layer (31) gradually decreases from the direction away from to the end of the supporting beam (3).

7. The column repair method according to claim 1, characterized in that, The temporary support (4) includes a first jack (41), the first lifting rod of the first jack (41) extends in the vertical direction, and the support end is the end of the first lifting rod.

8. The column repair method according to claim 1, characterized in that, Each of the temporary support members (4) includes a second jack (42), a push block (43), and a connecting block (44). The connecting block (44) is installed on the lower surface of the support beam (3). The lower surface of the connecting block (44) is provided with a first guide surface. The distance between the first guide surface and the lower surface of the support beam (3) gradually decreases as it approaches or moves away from another temporary support member (4). The second jack (42) is placed on the earthwork. The first lifting rod of the second jack (42) extends horizontally. The push block (43) is located below the connecting block (44). The upper surface of the push block (43) is provided with a second guide surface. The distance between the second guide surface and the lower surface of the support beam (3) gradually decreases as it approaches or moves away from another temporary support member (4). The push block (43) can move along the length of the support beam (3) under the push of the second jack (42). The push block (43) can move until the first guide surface abuts against the second guide surface.

9. A method for repairing a column according to claim 8, characterized in that, The earthwork is provided with a polytetrafluoroethylene plate, and the pusher (43) can slide on the polytetrafluoroethylene plate.

10. A column repair method according to claim 8, characterized in that, After the cleaning of the problem section is completed, the push block (43) and the connecting block (44) of the two temporary support members (4) are connected to the support beam (3) and the column through the connecting concrete (6), and then the second jack (42) is removed.

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